R help - Sep 2007 - It works but I don't know how (nice scientific notation with Lattice)

Hi,

I had problems to display my results in a nice way (according to me).
Thanks to posts of people of this forum, I solved my problems (ticks with a
scientific notation and how to write nicely "V/m2" in the label of the
x-axis) but ... I don't understand the script.

Can somebody explain me how the short script below writes the scientific
notation ?
I guess it is the result of 

ans$bottom$labels$labels <- parse(text = ans$bottom$labels$labels)

but it is really not clear to me.

Thanks in advance for your explainations
Ptit Bleu.

--------------------------------------------------------------------


library(lattice)

x<-c(10,100,1000,10000,100000,20,200,2000,20000,200000)
y<-c(1,2,3,4,5,2,4,6,8,10)
z<-c(1,1,1,1,1,2,2,2,2,2)

xyplot(y ~ x | z,
  scales = list(x = list(log = T)),
  xscale.components = function(...) {
                                      ans <- xscale.components.default(...)
                                      ans$bottom$labels$labels <- parse(text
= ans$bottom$labels$labels)
                                      ans
                                    }
  , xlab=(expression(paste("X (V/",m^2,")"))) , ylab="Y
(arb. unit)")

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